Those wavering might be interested to know that LCE have an extra £100 off the 17, 25 and 45mm f1.2 primes until the end of the month.

That's on top of the Olympus £150 cashback, and by my reckoning and camerapricebuster it makes this the lowest price so far for these lenses from a bricks and mortar UK supplier (outside special deals at the Photography Show and similar):